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arxiv: 1607.01420 · v1 · submitted 2016-07-05 · 🌀 gr-qc

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Gravitational waveforms in scalar-tensor gravity at 2PN relative order

Noah Sennett , Sylvain Marsat , Alessandra Buonanno
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classification 🌀 gr-qc
keywords radiationbinarycomputegravityscalar-tensorsystemswaveformdipolar
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We compute the gravitational waveform from a binary system in scalar-tensor gravity at 2PN relative order. We restrict our calculation to non-spinning binary systems on quasi-circular orbits and compute the spin-weighted spherical modes of the radiation. The evolution of the phase of the waveform is computed in the time and frequency domains. The emission of dipolar radiation is the lowest-order dissipative process in scalar-tensor gravity. However, stringent constraints set by current astrophysical observations indicate that this effect is subdominant to quadrupolar radiation for most prospective gravitational-wave sources. We compute the waveform for systems whose inspiral is driven by: (a) dipolar radiation (e.g., binary pulsars or spontaneously scalarized systems) and (b) quadrupolar radiation (e.g., typical sources for space-based and ground-based detectors).

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